that have become iconic in america's bizarre and shameful epidemic of gun violence. >> reporter: public outrage over the massacre has also emboldened members of congress to challenge the power of the gun lobby. >> the political power is much like the wizard of oz. they're bullies. and what's most important is, they really don't represent their membership. the members are overwhelmingly in favor of responsible use of guns and responsible rules. >> reporter: feelings are running very high after this tragedy. of course, there's been a lot of talk of a turning point. the president today will announce that he's putting vice president biden in charge of a process to look at possible new legislation. but, look, change doesn't happen quickly in washington. there have been about a dozen attempts to bring back the assault weapons ban. they've all failed in congressional committee. and the national rifle association spent $17 million this year to influence legislation and public opinion. it'll be looking out for its interests long after the outrage subsides. charlie, norah? >> bill plante, thanks.